EUVD-2026-35785
GHSA-xvhc-r5q4-hcgj
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
1DescriptionCVE.org
InCopy versions 21.3, 20.5.3 and earlier are affected by a Stack-based Buffer Overflow vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
AnalysisAI
Stack-based buffer overflow in Adobe InCopy 21.3, 20.5.3 and earlier enables arbitrary code execution in the context of the logged-in user when a victim opens a maliciously crafted document. The flaw is locally exploitable via file-format parsing and requires user interaction, with no public exploit identified at time of analysis. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to open a maliciously crafted InCopy document in a vulnerable version of Adobe InCopy (21.3 or 20.5.3 and earlier) - the attacker cannot trigger the bug remotely without that user action. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H describes a local attack requiring user interaction (opening a file) but no prior authentication or privileges on the target, with high impact across the CIA triad - a typical profile for client-side document-parsing bugs. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker emails a creative-team employee a 'draft revision' InCopy document, posing as an outside agency or freelance editor; when the employee opens the file in InCopy, the malformed structure triggers the stack overflow and runs attacker-chosen code as that user, enabling credential theft, document exfiltration from shared publishing repositories, or a foothold for lateral movement. No public exploit is identified at time of analysis, but the bug class (CWE-121 in a desktop parser with UI:R) is well within the capability of any actor experienced in document-based client-side exploitation. |
| Remediation | Apply the vendor-released patches referenced in Adobe Security Bulletin APSB26-59 (https://helpx.adobe.com/security/products/incopy/apsb26-59.html) - upgrade InCopy 21.x to the fixed release listed in that bulletin and the 20.x branch to a version newer than 20.5.3. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and inventory all systems running Adobe InCopy 21.3, 20.5.3, or earlier. …
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Arbitrary code execution in Adobe InCopy 21.3, 20.5.3, and earlier allows attackers to run code as the current user when
Arbitrary code execution in Adobe InCopy versions 21.3, 20.5.3 and earlier occurs when a user opens a maliciously crafte
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External POC / Exploit Code
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